[U-Boot] [PATCH v2] arm: exynos: change to use clrbits macro instead of readl/writel function

[U-Boot] [PATCH v2] arm: exynos: change to use clrbits macro instead of readl/writel function

[Inha Song]

Use setbits/clrbits macro instead of readl/writel function

Signed-off-by: Inha Song <ideal.song@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Tested-by: Przemyslaw Marczak <p.marczak@samsung.com>
---
Changes for v2:
- Coding Style cleanup
- add signed-off-by

 arch/arm/cpu/armv7/exynos/clock.c |   82 +++++++++----------------------------
 1 file changed, 20 insertions(+), 62 deletions(-)

diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
index 5bde9d1..6c589c9 100644
--- a/arch/arm/cpu/armv7/exynos/clock.c
+++ b/arch/arm/cpu/armv7/exynos/clock.c
@@ -870,7 +870,6 @@ static void exynos4_set_mmc_clk(int dev_index, unsigned int div)
 	struct exynos4_clock *clk =
 		(struct exynos4_clock *)samsung_get_base_clock();
 	unsigned int addr;
-	unsigned int val;
 
 	/*
 	 * CLK_DIV_FSYS1
@@ -890,10 +889,8 @@ static void exynos4_set_mmc_clk(int dev_index, unsigned int div)
 		dev_index -= 2;
 	}
 
-	val = readl(addr);
-	val &= ~(0xff << ((dev_index << 4) + 8));
-	val |= (div & 0xff) << ((dev_index << 4) + 8);
-	writel(val, addr);
+	clrsetbits_le32(addr, 0xff << ((dev_index << 4) + 8),
+			(div & 0xff) << ((dev_index << 4) + 8));
 }
 
 /* exynos4x12: set the mmc clock */
@@ -902,7 +899,6 @@ static void exynos4x12_set_mmc_clk(int dev_index, unsigned int div)
 	struct exynos4x12_clock *clk =
 		(struct exynos4x12_clock *)samsung_get_base_clock();
 	unsigned int addr;
-	unsigned int val;
 
 	/*
 	 * CLK_DIV_FSYS1
@@ -917,10 +913,8 @@ static void exynos4x12_set_mmc_clk(int dev_index, unsigned int div)
 		dev_index -= 2;
 	}
 
-	val = readl(addr);
-	val &= ~(0xff << ((dev_index << 4) + 8));
-	val |= (div & 0xff) << ((dev_index << 4) + 8);
-	writel(val, addr);
+	clrsetbits_le32(addr, 0xff << ((dev_index << 4) + 8),
+			(div & 0xff) << ((dev_index << 4) + 8));
 }
 
 /* exynos5: set the mmc clock */
@@ -929,7 +923,6 @@ static void exynos5_set_mmc_clk(int dev_index, unsigned int div)
 	struct exynos5_clock *clk =
 		(struct exynos5_clock *)samsung_get_base_clock();
 	unsigned int addr;
-	unsigned int val;
 
 	/*
 	 * CLK_DIV_FSYS1
@@ -944,10 +937,8 @@ static void exynos5_set_mmc_clk(int dev_index, unsigned int div)
 		dev_index -= 2;
 	}
 
-	val = readl(addr);
-	val &= ~(0xff << ((dev_index << 4) + 8));
-	val |= (div & 0xff) << ((dev_index << 4) + 8);
-	writel(val, addr);
+	clrsetbits_le32(addr, 0xff << ((dev_index << 4) + 8),
+			(div & 0xff) << ((dev_index << 4) + 8));
 }
 
 /* exynos5: set the mmc clock */
@@ -956,7 +947,7 @@ static void exynos5420_set_mmc_clk(int dev_index, unsigned int div)
 	struct exynos5420_clock *clk =
 		(struct exynos5420_clock *)samsung_get_base_clock();
 	unsigned int addr;
-	unsigned int val, shift;
+	unsigned int shift;
 
 	/*
 	 * CLK_DIV_FSYS1
@@ -967,10 +958,7 @@ static void exynos5420_set_mmc_clk(int dev_index, unsigned int div)
 	addr = (unsigned int)&clk->div_fsys1;
 	shift = dev_index * 10;
 
-	val = readl(addr);
-	val &= ~(0x3ff << shift);
-	val |= (div & 0x3ff) << shift;
-	writel(val, addr);
+	clrsetbits_le32(addr, 0x3ff << shift, (div & 0x3ff) << shift);
 }
 
 /* get_lcd_clk: return lcd clock frequency */
@@ -1061,7 +1049,6 @@ void exynos4_set_lcd_clk(void)
 {
 	struct exynos4_clock *clk =
 	    (struct exynos4_clock *)samsung_get_base_clock();
-	unsigned int cfg = 0;
 
 	/*
 	 * CLK_GATE_BLOCK
@@ -1073,9 +1060,7 @@ void exynos4_set_lcd_clk(void)
 	 * CLK_LCD1	[5]
 	 * CLK_GPS	[7]
 	 */
-	cfg = readl(&clk->gate_block);
-	cfg |= 1 << 4;
-	writel(cfg, &clk->gate_block);
+	setbits_le32(&clk->gate_block, 1 << 4);
 
 	/*
 	 * CLK_SRC_LCD0
@@ -1085,10 +1070,7 @@ void exynos4_set_lcd_clk(void)
 	 * MIPI0_SEL		[12:15]
 	 * set lcd0 src clock 0x6: SCLK_MPLL
 	 */
-	cfg = readl(&clk->src_lcd0);
-	cfg &= ~(0xf);
-	cfg |= 0x6;
-	writel(cfg, &clk->src_lcd0);
+	clrsetbits_le32(&clk->src_lcd0, 0x9, 0x6);
 
 	/*
 	 * CLK_GATE_IP_LCD0
@@ -1100,9 +1082,7 @@ void exynos4_set_lcd_clk(void)
 	 * CLK_PPMULCD0		[5]
 	 * Gating all clocks for FIMD0
 	 */
-	cfg = readl(&clk->gate_ip_lcd0);
-	cfg |= 1 << 0;
-	writel(cfg, &clk->gate_ip_lcd0);
+	setbits_le32(&clk->gate_ip_lcd0, 1 << 0);
 
 	/*
 	 * CLK_DIV_LCD0
@@ -1114,16 +1094,13 @@ void exynos4_set_lcd_clk(void)
 	 * MIPI0_PRE_RATIO	[23:20]
 	 * set fimd ratio
 	 */
-	cfg &= ~(0xf);
-	cfg |= 0x1;
-	writel(cfg, &clk->div_lcd0);
+	clrsetbits_le32(&clk->div_lcd0, 0xe, 0x1);
 }
 
 void exynos5_set_lcd_clk(void)
 {
 	struct exynos5_clock *clk =
 	    (struct exynos5_clock *)samsung_get_base_clock();
-	unsigned int cfg = 0;
 
 	/*
 	 * CLK_GATE_BLOCK
@@ -1135,9 +1112,7 @@ void exynos5_set_lcd_clk(void)
 	 * CLK_LCD1	[5]
 	 * CLK_GPS	[7]
 	 */
-	cfg = readl(&clk->gate_block);
-	cfg |= 1 << 4;
-	writel(cfg, &clk->gate_block);
+	setbits_le32(&clk->gate_block, 1 << 4);
 
 	/*
 	 * CLK_SRC_LCD0
@@ -1147,10 +1122,7 @@ void exynos5_set_lcd_clk(void)
 	 * MIPI0_SEL		[12:15]
 	 * set lcd0 src clock 0x6: SCLK_MPLL
 	 */
-	cfg = readl(&clk->src_disp1_0);
-	cfg &= ~(0xf);
-	cfg |= 0x6;
-	writel(cfg, &clk->src_disp1_0);
+	clrsetbits_le32(&clk->src_disp1_0, 0x9, 0x6);
 
 	/*
 	 * CLK_GATE_IP_LCD0
@@ -1162,9 +1134,7 @@ void exynos5_set_lcd_clk(void)
 	 * CLK_PPMULCD0		[5]
 	 * Gating all clocks for FIMD0
 	 */
-	cfg = readl(&clk->gate_ip_disp1);
-	cfg |= 1 << 0;
-	writel(cfg, &clk->gate_ip_disp1);
+	setbits_le32(&clk->gate_ip_disp1, 1 << 0);
 
 	/*
 	 * CLK_DIV_LCD0
@@ -1176,16 +1146,13 @@ void exynos5_set_lcd_clk(void)
 	 * MIPI0_PRE_RATIO	[23:20]
 	 * set fimd ratio
 	 */
-	cfg &= ~(0xf);
-	cfg |= 0x0;
-	writel(cfg, &clk->div_disp1_0);
+	clrbits_le32(&clk->div_disp1_0, 0xf);
 }
 
 void exynos4_set_mipi_clk(void)
 {
 	struct exynos4_clock *clk =
 	    (struct exynos4_clock *)samsung_get_base_clock();
-	unsigned int cfg = 0;
 
 	/*
 	 * CLK_SRC_LCD0
@@ -1195,10 +1162,7 @@ void exynos4_set_mipi_clk(void)
 	 * MIPI0_SEL		[12:15]
 	 * set mipi0 src clock 0x6: SCLK_MPLL
 	 */
-	cfg = readl(&clk->src_lcd0);
-	cfg &= ~(0xf << 12);
-	cfg |= (0x6 << 12);
-	writel(cfg, &clk->src_lcd0);
+	clrsetbits_le32(&clk->src_lcd0, 0x9 << 12, 0x6 << 12);
 
 	/*
 	 * CLK_SRC_MASK_LCD0
@@ -1208,9 +1172,7 @@ void exynos4_set_mipi_clk(void)
 	 * MIPI0_MASK		[12]
 	 * set src mask mipi0 0x1: Unmask
 	 */
-	cfg = readl(&clk->src_mask_lcd0);
-	cfg |= (0x1 << 12);
-	writel(cfg, &clk->src_mask_lcd0);
+	setbits_le32(&clk->src_mask_lcd0, 0x1 << 12);
 
 	/*
 	 * CLK_GATE_IP_LCD0
@@ -1222,9 +1184,7 @@ void exynos4_set_mipi_clk(void)
 	 * CLK_PPMULCD0		[5]
 	 * Gating all clocks for MIPI0
 	 */
-	cfg = readl(&clk->gate_ip_lcd0);
-	cfg |= 1 << 3;
-	writel(cfg, &clk->gate_ip_lcd0);
+	setbits_le32(&clk->gate_ip_lcd0, 1 << 3);
 
 	/*
 	 * CLK_DIV_LCD0
@@ -1236,9 +1196,7 @@ void exynos4_set_mipi_clk(void)
 	 * MIPI0_PRE_RATIO	[23:20]
 	 * set mipi ratio
 	 */
-	cfg &= ~(0xf << 16);
-	cfg |= (0x1 << 16);
-	writel(cfg, &clk->div_lcd0);
+	clrsetbits_le32(&clk->div_lcd0, 0xe << 16, 0x1 << 16);
 }
 
 /*
-- 
1.7.9.5

[U-Boot] [PATCH v2] arm: exynos: change to use clrbits macro instead of readl/writel function

[Jaehoon Chung]

Acked-by: Jaehoon Chung <jh80.chung@samsung.com>

Best Regards,
Jaehoon Chung

On 01/15/2014 02:27 PM, Inha Song wrote:
> Use setbits/clrbits macro instead of readl/writel function
> 
> Signed-off-by: Inha Song <ideal.song@samsung.com>
> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
> Tested-by: Przemyslaw Marczak <p.marczak@samsung.com>
> ---
> Changes for v2:
> - Coding Style cleanup
> - add signed-off-by
> 
>  arch/arm/cpu/armv7/exynos/clock.c |   82 +++++++++----------------------------
>  1 file changed, 20 insertions(+), 62 deletions(-)
> 
> diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
> index 5bde9d1..6c589c9 100644
> --- a/arch/arm/cpu/armv7/exynos/clock.c
> +++ b/arch/arm/cpu/armv7/exynos/clock.c
> @@ -870,7 +870,6 @@ static void exynos4_set_mmc_clk(int dev_index, unsigned int div)
>  	struct exynos4_clock *clk =
>  		(struct exynos4_clock *)samsung_get_base_clock();
>  	unsigned int addr;
> -	unsigned int val;
>  
>  	/*
>  	 * CLK_DIV_FSYS1
> @@ -890,10 +889,8 @@ static void exynos4_set_mmc_clk(int dev_index, unsigned int div)
>  		dev_index -= 2;
>  	}
>  
> -	val = readl(addr);
> -	val &= ~(0xff << ((dev_index << 4) + 8));
> -	val |= (div & 0xff) << ((dev_index << 4) + 8);
> -	writel(val, addr);
> +	clrsetbits_le32(addr, 0xff << ((dev_index << 4) + 8),
> +			(div & 0xff) << ((dev_index << 4) + 8));
>  }
>  
>  /* exynos4x12: set the mmc clock */
> @@ -902,7 +899,6 @@ static void exynos4x12_set_mmc_clk(int dev_index, unsigned int div)
>  	struct exynos4x12_clock *clk =
>  		(struct exynos4x12_clock *)samsung_get_base_clock();
>  	unsigned int addr;
> -	unsigned int val;
>  
>  	/*
>  	 * CLK_DIV_FSYS1
> @@ -917,10 +913,8 @@ static void exynos4x12_set_mmc_clk(int dev_index, unsigned int div)
>  		dev_index -= 2;
>  	}
>  
> -	val = readl(addr);
> -	val &= ~(0xff << ((dev_index << 4) + 8));
> -	val |= (div & 0xff) << ((dev_index << 4) + 8);
> -	writel(val, addr);
> +	clrsetbits_le32(addr, 0xff << ((dev_index << 4) + 8),
> +			(div & 0xff) << ((dev_index << 4) + 8));
>  }
>  
>  /* exynos5: set the mmc clock */
> @@ -929,7 +923,6 @@ static void exynos5_set_mmc_clk(int dev_index, unsigned int div)
>  	struct exynos5_clock *clk =
>  		(struct exynos5_clock *)samsung_get_base_clock();
>  	unsigned int addr;
> -	unsigned int val;
>  
>  	/*
>  	 * CLK_DIV_FSYS1
> @@ -944,10 +937,8 @@ static void exynos5_set_mmc_clk(int dev_index, unsigned int div)
>  		dev_index -= 2;
>  	}
>  
> -	val = readl(addr);
> -	val &= ~(0xff << ((dev_index << 4) + 8));
> -	val |= (div & 0xff) << ((dev_index << 4) + 8);
> -	writel(val, addr);
> +	clrsetbits_le32(addr, 0xff << ((dev_index << 4) + 8),
> +			(div & 0xff) << ((dev_index << 4) + 8));
>  }
>  
>  /* exynos5: set the mmc clock */
> @@ -956,7 +947,7 @@ static void exynos5420_set_mmc_clk(int dev_index, unsigned int div)
>  	struct exynos5420_clock *clk =
>  		(struct exynos5420_clock *)samsung_get_base_clock();
>  	unsigned int addr;
> -	unsigned int val, shift;
> +	unsigned int shift;
>  
>  	/*
>  	 * CLK_DIV_FSYS1
> @@ -967,10 +958,7 @@ static void exynos5420_set_mmc_clk(int dev_index, unsigned int div)
>  	addr = (unsigned int)&clk->div_fsys1;
>  	shift = dev_index * 10;
>  
> -	val = readl(addr);
> -	val &= ~(0x3ff << shift);
> -	val |= (div & 0x3ff) << shift;
> -	writel(val, addr);
> +	clrsetbits_le32(addr, 0x3ff << shift, (div & 0x3ff) << shift);
>  }
>  
>  /* get_lcd_clk: return lcd clock frequency */
> @@ -1061,7 +1049,6 @@ void exynos4_set_lcd_clk(void)
>  {
>  	struct exynos4_clock *clk =
>  	    (struct exynos4_clock *)samsung_get_base_clock();
> -	unsigned int cfg = 0;
>  
>  	/*
>  	 * CLK_GATE_BLOCK
> @@ -1073,9 +1060,7 @@ void exynos4_set_lcd_clk(void)
>  	 * CLK_LCD1	[5]
>  	 * CLK_GPS	[7]
>  	 */
> -	cfg = readl(&clk->gate_block);
> -	cfg |= 1 << 4;
> -	writel(cfg, &clk->gate_block);
> +	setbits_le32(&clk->gate_block, 1 << 4);
>  
>  	/*
>  	 * CLK_SRC_LCD0
> @@ -1085,10 +1070,7 @@ void exynos4_set_lcd_clk(void)
>  	 * MIPI0_SEL		[12:15]
>  	 * set lcd0 src clock 0x6: SCLK_MPLL
>  	 */
> -	cfg = readl(&clk->src_lcd0);
> -	cfg &= ~(0xf);
> -	cfg |= 0x6;
> -	writel(cfg, &clk->src_lcd0);
> +	clrsetbits_le32(&clk->src_lcd0, 0x9, 0x6);
>  
>  	/*
>  	 * CLK_GATE_IP_LCD0
> @@ -1100,9 +1082,7 @@ void exynos4_set_lcd_clk(void)
>  	 * CLK_PPMULCD0		[5]
>  	 * Gating all clocks for FIMD0
>  	 */
> -	cfg = readl(&clk->gate_ip_lcd0);
> -	cfg |= 1 << 0;
> -	writel(cfg, &clk->gate_ip_lcd0);
> +	setbits_le32(&clk->gate_ip_lcd0, 1 << 0);
>  
>  	/*
>  	 * CLK_DIV_LCD0
> @@ -1114,16 +1094,13 @@ void exynos4_set_lcd_clk(void)
>  	 * MIPI0_PRE_RATIO	[23:20]
>  	 * set fimd ratio
>  	 */
> -	cfg &= ~(0xf);
> -	cfg |= 0x1;
> -	writel(cfg, &clk->div_lcd0);
> +	clrsetbits_le32(&clk->div_lcd0, 0xe, 0x1);
>  }
>  
>  void exynos5_set_lcd_clk(void)
>  {
>  	struct exynos5_clock *clk =
>  	    (struct exynos5_clock *)samsung_get_base_clock();
> -	unsigned int cfg = 0;
>  
>  	/*
>  	 * CLK_GATE_BLOCK
> @@ -1135,9 +1112,7 @@ void exynos5_set_lcd_clk(void)
>  	 * CLK_LCD1	[5]
>  	 * CLK_GPS	[7]
>  	 */
> -	cfg = readl(&clk->gate_block);
> -	cfg |= 1 << 4;
> -	writel(cfg, &clk->gate_block);
> +	setbits_le32(&clk->gate_block, 1 << 4);
>  
>  	/*
>  	 * CLK_SRC_LCD0
> @@ -1147,10 +1122,7 @@ void exynos5_set_lcd_clk(void)
>  	 * MIPI0_SEL		[12:15]
>  	 * set lcd0 src clock 0x6: SCLK_MPLL
>  	 */
> -	cfg = readl(&clk->src_disp1_0);
> -	cfg &= ~(0xf);
> -	cfg |= 0x6;
> -	writel(cfg, &clk->src_disp1_0);
> +	clrsetbits_le32(&clk->src_disp1_0, 0x9, 0x6);
>  
>  	/*
>  	 * CLK_GATE_IP_LCD0
> @@ -1162,9 +1134,7 @@ void exynos5_set_lcd_clk(void)
>  	 * CLK_PPMULCD0		[5]
>  	 * Gating all clocks for FIMD0
>  	 */
> -	cfg = readl(&clk->gate_ip_disp1);
> -	cfg |= 1 << 0;
> -	writel(cfg, &clk->gate_ip_disp1);
> +	setbits_le32(&clk->gate_ip_disp1, 1 << 0);
>  
>  	/*
>  	 * CLK_DIV_LCD0
> @@ -1176,16 +1146,13 @@ void exynos5_set_lcd_clk(void)
>  	 * MIPI0_PRE_RATIO	[23:20]
>  	 * set fimd ratio
>  	 */
> -	cfg &= ~(0xf);
> -	cfg |= 0x0;
> -	writel(cfg, &clk->div_disp1_0);
> +	clrbits_le32(&clk->div_disp1_0, 0xf);
>  }
>  
>  void exynos4_set_mipi_clk(void)
>  {
>  	struct exynos4_clock *clk =
>  	    (struct exynos4_clock *)samsung_get_base_clock();
> -	unsigned int cfg = 0;
>  
>  	/*
>  	 * CLK_SRC_LCD0
> @@ -1195,10 +1162,7 @@ void exynos4_set_mipi_clk(void)
>  	 * MIPI0_SEL		[12:15]
>  	 * set mipi0 src clock 0x6: SCLK_MPLL
>  	 */
> -	cfg = readl(&clk->src_lcd0);
> -	cfg &= ~(0xf << 12);
> -	cfg |= (0x6 << 12);
> -	writel(cfg, &clk->src_lcd0);
> +	clrsetbits_le32(&clk->src_lcd0, 0x9 << 12, 0x6 << 12);
>  
>  	/*
>  	 * CLK_SRC_MASK_LCD0
> @@ -1208,9 +1172,7 @@ void exynos4_set_mipi_clk(void)
>  	 * MIPI0_MASK		[12]
>  	 * set src mask mipi0 0x1: Unmask
>  	 */
> -	cfg = readl(&clk->src_mask_lcd0);
> -	cfg |= (0x1 << 12);
> -	writel(cfg, &clk->src_mask_lcd0);
> +	setbits_le32(&clk->src_mask_lcd0, 0x1 << 12);
>  
>  	/*
>  	 * CLK_GATE_IP_LCD0
> @@ -1222,9 +1184,7 @@ void exynos4_set_mipi_clk(void)
>  	 * CLK_PPMULCD0		[5]
>  	 * Gating all clocks for MIPI0
>  	 */
> -	cfg = readl(&clk->gate_ip_lcd0);
> -	cfg |= 1 << 3;
> -	writel(cfg, &clk->gate_ip_lcd0);
> +	setbits_le32(&clk->gate_ip_lcd0, 1 << 3);
>  
>  	/*
>  	 * CLK_DIV_LCD0
> @@ -1236,9 +1196,7 @@ void exynos4_set_mipi_clk(void)
>  	 * MIPI0_PRE_RATIO	[23:20]
>  	 * set mipi ratio
>  	 */
> -	cfg &= ~(0xf << 16);
> -	cfg |= (0x1 << 16);
> -	writel(cfg, &clk->div_lcd0);
> +	clrsetbits_le32(&clk->div_lcd0, 0xe << 16, 0x1 << 16);
>  }
>  
>  /*
> 

[U-Boot] [PATCH v2] arm: exynos: change to use clrbits macro instead of readl/writel function

[Gerhard Sittig]

On Wed, Jan 15, 2014 at 14:27 +0900, Inha Song wrote:
> 
> Use setbits/clrbits macro instead of readl/writel function

Just saw v2 after replying to v1 (which is only from yesterday).
Please consider the concerns raised there, too.


virtually yours
Gerhard Sittig
-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr. 5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de

[U-Boot] [PATCH v2] arm: exynos: change to use clrbits macro instead of readl/writel function

[Minkyu Kang]

On 15/01/14 14:27, Inha Song wrote:
> Use setbits/clrbits macro instead of readl/writel function
> 
> Signed-off-by: Inha Song <ideal.song@samsung.com>
> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
> Tested-by: Przemyslaw Marczak <p.marczak@samsung.com>
> ---
> Changes for v2:
> - Coding Style cleanup
> - add signed-off-by
> 
>  arch/arm/cpu/armv7/exynos/clock.c |   82 +++++++++----------------------------
>  1 file changed, 20 insertions(+), 62 deletions(-)
  
>  	/*
>  	 * CLK_SRC_LCD0
> @@ -1085,10 +1070,7 @@ void exynos4_set_lcd_clk(void)
>  	 * MIPI0_SEL		[12:15]
>  	 * set lcd0 src clock 0x6: SCLK_MPLL
>  	 */
> -	cfg = readl(&clk->src_lcd0);
> -	cfg &= ~(0xf);
> -	cfg |= 0x6;
> -	writel(cfg, &clk->src_lcd0);
> +	clrsetbits_le32(&clk->src_lcd0, 0x9, 0x6);

0x9? It seems to be 0xf.

>  
>  	/*
>  	 * CLK_GATE_IP_LCD0
> @@ -1100,9 +1082,7 @@ void exynos4_set_lcd_clk(void)
>  	 * CLK_PPMULCD0		[5]
>  	 * Gating all clocks for FIMD0
>  	 */
> -	cfg = readl(&clk->gate_ip_lcd0);
> -	cfg |= 1 << 0;
> -	writel(cfg, &clk->gate_ip_lcd0);
> +	setbits_le32(&clk->gate_ip_lcd0, 1 << 0);
>  
>  	/*
>  	 * CLK_DIV_LCD0
> @@ -1114,16 +1094,13 @@ void exynos4_set_lcd_clk(void)
>  	 * MIPI0_PRE_RATIO	[23:20]
>  	 * set fimd ratio
>  	 */
> -	cfg &= ~(0xf);
> -	cfg |= 0x1;
> -	writel(cfg, &clk->div_lcd0);
> +	clrsetbits_le32(&clk->div_lcd0, 0xe, 0x1);

ditto.

>  }
>  
>  void exynos5_set_lcd_clk(void)
>  {
>  	struct exynos5_clock *clk =
>  	    (struct exynos5_clock *)samsung_get_base_clock();
> -	unsigned int cfg = 0;
>  
>  	/*
>  	 * CLK_GATE_BLOCK
> @@ -1135,9 +1112,7 @@ void exynos5_set_lcd_clk(void)
>  	 * CLK_LCD1	[5]
>  	 * CLK_GPS	[7]
>  	 */
> -	cfg = readl(&clk->gate_block);
> -	cfg |= 1 << 4;
> -	writel(cfg, &clk->gate_block);
> +	setbits_le32(&clk->gate_block, 1 << 4);
>  
>  	/*
>  	 * CLK_SRC_LCD0
> @@ -1147,10 +1122,7 @@ void exynos5_set_lcd_clk(void)
>  	 * MIPI0_SEL		[12:15]
>  	 * set lcd0 src clock 0x6: SCLK_MPLL
>  	 */
> -	cfg = readl(&clk->src_disp1_0);
> -	cfg &= ~(0xf);
> -	cfg |= 0x6;
> -	writel(cfg, &clk->src_disp1_0);
> +	clrsetbits_le32(&clk->src_disp1_0, 0x9, 0x6);

ditto.

>  
>  	/*
>  	 * CLK_GATE_IP_LCD0
> @@ -1162,9 +1134,7 @@ void exynos5_set_lcd_clk(void)
>  	 * CLK_PPMULCD0		[5]
>  	 * Gating all clocks for FIMD0
>  	 */
> -	cfg = readl(&clk->gate_ip_disp1);
> -	cfg |= 1 << 0;
> -	writel(cfg, &clk->gate_ip_disp1);
> +	setbits_le32(&clk->gate_ip_disp1, 1 << 0);
>  
>  	/*
>  	 * CLK_DIV_LCD0
> @@ -1176,16 +1146,13 @@ void exynos5_set_lcd_clk(void)
>  	 * MIPI0_PRE_RATIO	[23:20]
>  	 * set fimd ratio
>  	 */
> -	cfg &= ~(0xf);
> -	cfg |= 0x0;
> -	writel(cfg, &clk->div_disp1_0);
> +	clrbits_le32(&clk->div_disp1_0, 0xf);
>  }
>  
>  void exynos4_set_mipi_clk(void)
>  {
>  	struct exynos4_clock *clk =
>  	    (struct exynos4_clock *)samsung_get_base_clock();
> -	unsigned int cfg = 0;
>  
>  	/*
>  	 * CLK_SRC_LCD0
> @@ -1195,10 +1162,7 @@ void exynos4_set_mipi_clk(void)
>  	 * MIPI0_SEL		[12:15]
>  	 * set mipi0 src clock 0x6: SCLK_MPLL
>  	 */
> -	cfg = readl(&clk->src_lcd0);
> -	cfg &= ~(0xf << 12);
> -	cfg |= (0x6 << 12);
> -	writel(cfg, &clk->src_lcd0);
> +	clrsetbits_le32(&clk->src_lcd0, 0x9 << 12, 0x6 << 12);

ditto.

>  
>  	/*
>  	 * CLK_SRC_MASK_LCD0
> @@ -1208,9 +1172,7 @@ void exynos4_set_mipi_clk(void)
>  	 * MIPI0_MASK		[12]
>  	 * set src mask mipi0 0x1: Unmask
>  	 */
> -	cfg = readl(&clk->src_mask_lcd0);
> -	cfg |= (0x1 << 12);
> -	writel(cfg, &clk->src_mask_lcd0);
> +	setbits_le32(&clk->src_mask_lcd0, 0x1 << 12);
>  
>  	/*
>  	 * CLK_GATE_IP_LCD0
> @@ -1222,9 +1184,7 @@ void exynos4_set_mipi_clk(void)
>  	 * CLK_PPMULCD0		[5]
>  	 * Gating all clocks for MIPI0
>  	 */
> -	cfg = readl(&clk->gate_ip_lcd0);
> -	cfg |= 1 << 3;
> -	writel(cfg, &clk->gate_ip_lcd0);
> +	setbits_le32(&clk->gate_ip_lcd0, 1 << 3);
>  
>  	/*
>  	 * CLK_DIV_LCD0
> @@ -1236,9 +1196,7 @@ void exynos4_set_mipi_clk(void)
>  	 * MIPI0_PRE_RATIO	[23:20]
>  	 * set mipi ratio
>  	 */
> -	cfg &= ~(0xf << 16);
> -	cfg |= (0x1 << 16);
> -	writel(cfg, &clk->div_lcd0);
> +	clrsetbits_le32(&clk->div_lcd0, 0xe << 16, 0x1 << 16);

ditto.

>  }
>  
>  /*
> 

Thanks,
Minkyu Kang.

[U-Boot] [PATCH v2] arm: exynos: change to use clrbits macro instead of readl/writel function

[Inha Song]

Hi,

On Thu, 16 Jan 2014 16:50:37 +0900
Minkyu Kang <mk7.kang@samsung.com> wrote:

> On 15/01/14 14:27, Inha Song wrote:
> > Use setbits/clrbits macro instead of readl/writel function
> > 
> > Signed-off-by: Inha Song <ideal.song@samsung.com>
> > Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
> > Tested-by: Przemyslaw Marczak <p.marczak@samsung.com>
> > ---
> > Changes for v2:
> > - Coding Style cleanup
> > - add signed-off-by
> > 
> >  arch/arm/cpu/armv7/exynos/clock.c |   82 +++++++++----------------------------
> >  1 file changed, 20 insertions(+), 62 deletions(-)
>   
> >  	/*
> >  	 * CLK_SRC_LCD0
> > @@ -1085,10 +1070,7 @@ void exynos4_set_lcd_clk(void)
> >  	 * MIPI0_SEL		[12:15]
> >  	 * set lcd0 src clock 0x6: SCLK_MPLL
> >  	 */
> > -	cfg = readl(&clk->src_lcd0);
> > -	cfg &= ~(0xf);
> > -	cfg |= 0x6;
> > -	writel(cfg, &clk->src_lcd0);
> > +	clrsetbits_le32(&clk->src_lcd0, 0x9, 0x6);
> 
> 0x9? It seems to be 0xf.

I have set the only bit that must be cleared.

In case, I want to set src_lcd0 register to 0x6(b0110).
Therefore, do not need to clear a bit of the second and third. (don't care bits)

clrsetbits_le32(addr, 0x9, 0x6) == clrsetbits_le32(addr, 0xf, 0x6)
( reg &= ~b1xx1, reg |= b0110 == reg &= ~b1111, reg |= b0110 )

Do you think any way is better?

> 
> >  
> >  	/*
> >  	 * CLK_GATE_IP_LCD0
> > @@ -1100,9 +1082,7 @@ void exynos4_set_lcd_clk(void)
> >  	 * CLK_PPMULCD0		[5]
> >  	 * Gating all clocks for FIMD0
> >  	 */
> > -	cfg = readl(&clk->gate_ip_lcd0);
> > -	cfg |= 1 << 0;
> > -	writel(cfg, &clk->gate_ip_lcd0);
> > +	setbits_le32(&clk->gate_ip_lcd0, 1 << 0);
> >  
> >  	/*
> >  	 * CLK_DIV_LCD0
> > @@ -1114,16 +1094,13 @@ void exynos4_set_lcd_clk(void)
> >  	 * MIPI0_PRE_RATIO	[23:20]
> >  	 * set fimd ratio
> >  	 */
> > -	cfg &= ~(0xf);
> > -	cfg |= 0x1;
> > -	writel(cfg, &clk->div_lcd0);
> > +	clrsetbits_le32(&clk->div_lcd0, 0xe, 0x1);
> 
> ditto.

Ditto,

> 
> >  }
> >  
> >  void exynos5_set_lcd_clk(void)
> >  {
> >  	struct exynos5_clock *clk =
> >  	    (struct exynos5_clock *)samsung_get_base_clock();
> > -	unsigned int cfg = 0;
> >  
> >  	/*
> >  	 * CLK_GATE_BLOCK
> > @@ -1135,9 +1112,7 @@ void exynos5_set_lcd_clk(void)
> >  	 * CLK_LCD1	[5]
> >  	 * CLK_GPS	[7]
> >  	 */
> > -	cfg = readl(&clk->gate_block);
> > -	cfg |= 1 << 4;
> > -	writel(cfg, &clk->gate_block);
> > +	setbits_le32(&clk->gate_block, 1 << 4);
> >  
> >  	/*
> >  	 * CLK_SRC_LCD0
> > @@ -1147,10 +1122,7 @@ void exynos5_set_lcd_clk(void)
> >  	 * MIPI0_SEL		[12:15]
> >  	 * set lcd0 src clock 0x6: SCLK_MPLL
> >  	 */
> > -	cfg = readl(&clk->src_disp1_0);
> > -	cfg &= ~(0xf);
> > -	cfg |= 0x6;
> > -	writel(cfg, &clk->src_disp1_0);
> > +	clrsetbits_le32(&clk->src_disp1_0, 0x9, 0x6);
> 
> ditto.

Ditto,

> 
> >  
> >  	/*
> >  	 * CLK_GATE_IP_LCD0
> > @@ -1162,9 +1134,7 @@ void exynos5_set_lcd_clk(void)
> >  	 * CLK_PPMULCD0		[5]
> >  	 * Gating all clocks for FIMD0
> >  	 */
> > -	cfg = readl(&clk->gate_ip_disp1);
> > -	cfg |= 1 << 0;
> > -	writel(cfg, &clk->gate_ip_disp1);
> > +	setbits_le32(&clk->gate_ip_disp1, 1 << 0);
> >  
> >  	/*
> >  	 * CLK_DIV_LCD0
> > @@ -1176,16 +1146,13 @@ void exynos5_set_lcd_clk(void)
> >  	 * MIPI0_PRE_RATIO	[23:20]
> >  	 * set fimd ratio
> >  	 */
> > -	cfg &= ~(0xf);
> > -	cfg |= 0x0;
> > -	writel(cfg, &clk->div_disp1_0);
> > +	clrbits_le32(&clk->div_disp1_0, 0xf);
> >  }
> >  
> >  void exynos4_set_mipi_clk(void)
> >  {
> >  	struct exynos4_clock *clk =
> >  	    (struct exynos4_clock *)samsung_get_base_clock();
> > -	unsigned int cfg = 0;
> >  
> >  	/*
> >  	 * CLK_SRC_LCD0
> > @@ -1195,10 +1162,7 @@ void exynos4_set_mipi_clk(void)
> >  	 * MIPI0_SEL		[12:15]
> >  	 * set mipi0 src clock 0x6: SCLK_MPLL
> >  	 */
> > -	cfg = readl(&clk->src_lcd0);
> > -	cfg &= ~(0xf << 12);
> > -	cfg |= (0x6 << 12);
> > -	writel(cfg, &clk->src_lcd0);
> > +	clrsetbits_le32(&clk->src_lcd0, 0x9 << 12, 0x6 << 12);
> 
> ditto.

Ditto,

> 
> >  
> >  	/*
> >  	 * CLK_SRC_MASK_LCD0
> > @@ -1208,9 +1172,7 @@ void exynos4_set_mipi_clk(void)
> >  	 * MIPI0_MASK		[12]
> >  	 * set src mask mipi0 0x1: Unmask
> >  	 */
> > -	cfg = readl(&clk->src_mask_lcd0);
> > -	cfg |= (0x1 << 12);
> > -	writel(cfg, &clk->src_mask_lcd0);
> > +	setbits_le32(&clk->src_mask_lcd0, 0x1 << 12);
> >  
> >  	/*
> >  	 * CLK_GATE_IP_LCD0
> > @@ -1222,9 +1184,7 @@ void exynos4_set_mipi_clk(void)
> >  	 * CLK_PPMULCD0		[5]
> >  	 * Gating all clocks for MIPI0
> >  	 */
> > -	cfg = readl(&clk->gate_ip_lcd0);
> > -	cfg |= 1 << 3;
> > -	writel(cfg, &clk->gate_ip_lcd0);
> > +	setbits_le32(&clk->gate_ip_lcd0, 1 << 3);
> >  
> >  	/*
> >  	 * CLK_DIV_LCD0
> > @@ -1236,9 +1196,7 @@ void exynos4_set_mipi_clk(void)
> >  	 * MIPI0_PRE_RATIO	[23:20]
> >  	 * set mipi ratio
> >  	 */
> > -	cfg &= ~(0xf << 16);
> > -	cfg |= (0x1 << 16);
> > -	writel(cfg, &clk->div_lcd0);
> > +	clrsetbits_le32(&clk->div_lcd0, 0xe << 16, 0x1 << 16);
> 
> ditto.

Ditto,

> 
> >  }
> >  
> >  /*
> > 
> 
> Thanks,
> Minkyu Kang.


Do you think any way is better?
e.g) clrsetbits_le32(addr, 0x9, 0x6) vs clrsetbits_le32(addr, 0xf, 0x6)



Thanks,

-- 
Best Regards,
Inha Song

[U-Boot] [PATCH v2] arm: exynos: change to use clrbits macro instead of readl/writel function

[Jaehoon Chung]

On 01/16/2014 05:20 PM, Inha Song wrote:
> 
> Hi,
> 
> On Thu, 16 Jan 2014 16:50:37 +0900
> Minkyu Kang <mk7.kang@samsung.com> wrote:
> 
>> On 15/01/14 14:27, Inha Song wrote:
>>> Use setbits/clrbits macro instead of readl/writel function
>>>
>>> Signed-off-by: Inha Song <ideal.song@samsung.com>
>>> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
>>> Tested-by: Przemyslaw Marczak <p.marczak@samsung.com>
>>> ---
>>> Changes for v2:
>>> - Coding Style cleanup
>>> - add signed-off-by
>>>
>>>  arch/arm/cpu/armv7/exynos/clock.c |   82 +++++++++----------------------------
>>>  1 file changed, 20 insertions(+), 62 deletions(-)
>>   
>>>  	/*
>>>  	 * CLK_SRC_LCD0
>>> @@ -1085,10 +1070,7 @@ void exynos4_set_lcd_clk(void)
>>>  	 * MIPI0_SEL		[12:15]
>>>  	 * set lcd0 src clock 0x6: SCLK_MPLL
>>>  	 */
>>> -	cfg = readl(&clk->src_lcd0);
>>> -	cfg &= ~(0xf);
>>> -	cfg |= 0x6;
>>> -	writel(cfg, &clk->src_lcd0);
>>> +	clrsetbits_le32(&clk->src_lcd0, 0x9, 0x6);
>>
>> 0x9? It seems to be 0xf.
> 
> I have set the only bit that must be cleared.
> 
> In case, I want to set src_lcd0 register to 0x6(b0110).
> Therefore, do not need to clear a bit of the second and third. (don't care bits)
Don't care bits? then use the 0xf. 
I think that it's more readable to use 0xf.

Best Regards,
Jaehoon Chung

> 
> clrsetbits_le32(addr, 0x9, 0x6) == clrsetbits_le32(addr, 0xf, 0x6)
> ( reg &= ~b1xx1, reg |= b0110 == reg &= ~b1111, reg |= b0110 )
> 
> Do you think any way is better?
> 
>>
>>>  
>>>  	/*
>>>  	 * CLK_GATE_IP_LCD0
>>> @@ -1100,9 +1082,7 @@ void exynos4_set_lcd_clk(void)
>>>  	 * CLK_PPMULCD0		[5]
>>>  	 * Gating all clocks for FIMD0
>>>  	 */
>>> -	cfg = readl(&clk->gate_ip_lcd0);
>>> -	cfg |= 1 << 0;
>>> -	writel(cfg, &clk->gate_ip_lcd0);
>>> +	setbits_le32(&clk->gate_ip_lcd0, 1 << 0);
>>>  
>>>  	/*
>>>  	 * CLK_DIV_LCD0
>>> @@ -1114,16 +1094,13 @@ void exynos4_set_lcd_clk(void)
>>>  	 * MIPI0_PRE_RATIO	[23:20]
>>>  	 * set fimd ratio
>>>  	 */
>>> -	cfg &= ~(0xf);
>>> -	cfg |= 0x1;
>>> -	writel(cfg, &clk->div_lcd0);
>>> +	clrsetbits_le32(&clk->div_lcd0, 0xe, 0x1);
>>
>> ditto.
> 
> Ditto,
> 
>>
>>>  }
>>>  
>>>  void exynos5_set_lcd_clk(void)
>>>  {
>>>  	struct exynos5_clock *clk =
>>>  	    (struct exynos5_clock *)samsung_get_base_clock();
>>> -	unsigned int cfg = 0;
>>>  
>>>  	/*
>>>  	 * CLK_GATE_BLOCK
>>> @@ -1135,9 +1112,7 @@ void exynos5_set_lcd_clk(void)
>>>  	 * CLK_LCD1	[5]
>>>  	 * CLK_GPS	[7]
>>>  	 */
>>> -	cfg = readl(&clk->gate_block);
>>> -	cfg |= 1 << 4;
>>> -	writel(cfg, &clk->gate_block);
>>> +	setbits_le32(&clk->gate_block, 1 << 4);
>>>  
>>>  	/*
>>>  	 * CLK_SRC_LCD0
>>> @@ -1147,10 +1122,7 @@ void exynos5_set_lcd_clk(void)
>>>  	 * MIPI0_SEL		[12:15]
>>>  	 * set lcd0 src clock 0x6: SCLK_MPLL
>>>  	 */
>>> -	cfg = readl(&clk->src_disp1_0);
>>> -	cfg &= ~(0xf);
>>> -	cfg |= 0x6;
>>> -	writel(cfg, &clk->src_disp1_0);
>>> +	clrsetbits_le32(&clk->src_disp1_0, 0x9, 0x6);
>>
>> ditto.
> 
> Ditto,
> 
>>
>>>  
>>>  	/*
>>>  	 * CLK_GATE_IP_LCD0
>>> @@ -1162,9 +1134,7 @@ void exynos5_set_lcd_clk(void)
>>>  	 * CLK_PPMULCD0		[5]
>>>  	 * Gating all clocks for FIMD0
>>>  	 */
>>> -	cfg = readl(&clk->gate_ip_disp1);
>>> -	cfg |= 1 << 0;
>>> -	writel(cfg, &clk->gate_ip_disp1);
>>> +	setbits_le32(&clk->gate_ip_disp1, 1 << 0);
>>>  
>>>  	/*
>>>  	 * CLK_DIV_LCD0
>>> @@ -1176,16 +1146,13 @@ void exynos5_set_lcd_clk(void)
>>>  	 * MIPI0_PRE_RATIO	[23:20]
>>>  	 * set fimd ratio
>>>  	 */
>>> -	cfg &= ~(0xf);
>>> -	cfg |= 0x0;
>>> -	writel(cfg, &clk->div_disp1_0);
>>> +	clrbits_le32(&clk->div_disp1_0, 0xf);
>>>  }
>>>  
>>>  void exynos4_set_mipi_clk(void)
>>>  {
>>>  	struct exynos4_clock *clk =
>>>  	    (struct exynos4_clock *)samsung_get_base_clock();
>>> -	unsigned int cfg = 0;
>>>  
>>>  	/*
>>>  	 * CLK_SRC_LCD0
>>> @@ -1195,10 +1162,7 @@ void exynos4_set_mipi_clk(void)
>>>  	 * MIPI0_SEL		[12:15]
>>>  	 * set mipi0 src clock 0x6: SCLK_MPLL
>>>  	 */
>>> -	cfg = readl(&clk->src_lcd0);
>>> -	cfg &= ~(0xf << 12);
>>> -	cfg |= (0x6 << 12);
>>> -	writel(cfg, &clk->src_lcd0);
>>> +	clrsetbits_le32(&clk->src_lcd0, 0x9 << 12, 0x6 << 12);
>>
>> ditto.
> 
> Ditto,
> 
>>
>>>  
>>>  	/*
>>>  	 * CLK_SRC_MASK_LCD0
>>> @@ -1208,9 +1172,7 @@ void exynos4_set_mipi_clk(void)
>>>  	 * MIPI0_MASK		[12]
>>>  	 * set src mask mipi0 0x1: Unmask
>>>  	 */
>>> -	cfg = readl(&clk->src_mask_lcd0);
>>> -	cfg |= (0x1 << 12);
>>> -	writel(cfg, &clk->src_mask_lcd0);
>>> +	setbits_le32(&clk->src_mask_lcd0, 0x1 << 12);
>>>  
>>>  	/*
>>>  	 * CLK_GATE_IP_LCD0
>>> @@ -1222,9 +1184,7 @@ void exynos4_set_mipi_clk(void)
>>>  	 * CLK_PPMULCD0		[5]
>>>  	 * Gating all clocks for MIPI0
>>>  	 */
>>> -	cfg = readl(&clk->gate_ip_lcd0);
>>> -	cfg |= 1 << 3;
>>> -	writel(cfg, &clk->gate_ip_lcd0);
>>> +	setbits_le32(&clk->gate_ip_lcd0, 1 << 3);
>>>  
>>>  	/*
>>>  	 * CLK_DIV_LCD0
>>> @@ -1236,9 +1196,7 @@ void exynos4_set_mipi_clk(void)
>>>  	 * MIPI0_PRE_RATIO	[23:20]
>>>  	 * set mipi ratio
>>>  	 */
>>> -	cfg &= ~(0xf << 16);
>>> -	cfg |= (0x1 << 16);
>>> -	writel(cfg, &clk->div_lcd0);
>>> +	clrsetbits_le32(&clk->div_lcd0, 0xe << 16, 0x1 << 16);
>>
>> ditto.
> 
> Ditto,
> 
>>
>>>  }
>>>  
>>>  /*
>>>
>>
>> Thanks,
>> Minkyu Kang.
> 
> 
> Do you think any way is better?
> e.g) clrsetbits_le32(addr, 0x9, 0x6) vs clrsetbits_le32(addr, 0xf, 0x6)
> 
> 
> 
> Thanks,
> 

[U-Boot] [PATCH v2] arm: exynos: change to use clrbits macro instead of readl/writel function

[Minkyu Kang]

On 16/01/14 17:20, Inha Song wrote:
> 
> Hi,
> 
> On Thu, 16 Jan 2014 16:50:37 +0900
> Minkyu Kang <mk7.kang@samsung.com> wrote:
> 
>> On 15/01/14 14:27, Inha Song wrote:
>>> Use setbits/clrbits macro instead of readl/writel function
>>>
>>> Signed-off-by: Inha Song <ideal.song@samsung.com>
>>> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
>>> Tested-by: Przemyslaw Marczak <p.marczak@samsung.com>
>>> ---
>>> Changes for v2:
>>> - Coding Style cleanup
>>> - add signed-off-by
>>>
>>>  arch/arm/cpu/armv7/exynos/clock.c |   82 +++++++++----------------------------
>>>  1 file changed, 20 insertions(+), 62 deletions(-)
>>   
>>>  	/*
>>>  	 * CLK_SRC_LCD0
>>> @@ -1085,10 +1070,7 @@ void exynos4_set_lcd_clk(void)
>>>  	 * MIPI0_SEL		[12:15]
>>>  	 * set lcd0 src clock 0x6: SCLK_MPLL
>>>  	 */
>>> -	cfg = readl(&clk->src_lcd0);
>>> -	cfg &= ~(0xf);
>>> -	cfg |= 0x6;
>>> -	writel(cfg, &clk->src_lcd0);
>>> +	clrsetbits_le32(&clk->src_lcd0, 0x9, 0x6);
>>
>> 0x9? It seems to be 0xf.
> 
> I have set the only bit that must be cleared.
> 
> In case, I want to set src_lcd0 register to 0x6(b0110).
> Therefore, do not need to clear a bit of the second and third. (don't care bits)
> 
> clrsetbits_le32(addr, 0x9, 0x6) == clrsetbits_le32(addr, 0xf, 0x6)
> ( reg &= ~b1xx1, reg |= b0110 == reg &= ~b1111, reg |= b0110 )
> 
> Do you think any way is better?
> 

No..
0xF is mask of FIMD0_SEL that is 4 bits.
The mask value never be changed.

Thanks,
Minkyu Kang.

[U-Boot] [PATCH v2] arm: exynos: change to use clrbits macro instead of readl/writel function

[Jaehoon Chung]

On 01/16/2014 05:34 PM, Minkyu Kang wrote:
> On 16/01/14 17:20, Inha Song wrote:
>>
>> Hi,
>>
>> On Thu, 16 Jan 2014 16:50:37 +0900
>> Minkyu Kang <mk7.kang@samsung.com> wrote:
>>
>>> On 15/01/14 14:27, Inha Song wrote:
>>>> Use setbits/clrbits macro instead of readl/writel function
>>>>
>>>> Signed-off-by: Inha Song <ideal.song@samsung.com>
>>>> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
>>>> Tested-by: Przemyslaw Marczak <p.marczak@samsung.com>
>>>> ---
>>>> Changes for v2:
>>>> - Coding Style cleanup
>>>> - add signed-off-by
>>>>
>>>>  arch/arm/cpu/armv7/exynos/clock.c |   82 +++++++++----------------------------
>>>>  1 file changed, 20 insertions(+), 62 deletions(-)
>>>   
>>>>  	/*
>>>>  	 * CLK_SRC_LCD0
>>>> @@ -1085,10 +1070,7 @@ void exynos4_set_lcd_clk(void)
>>>>  	 * MIPI0_SEL		[12:15]
>>>>  	 * set lcd0 src clock 0x6: SCLK_MPLL
>>>>  	 */
>>>> -	cfg = readl(&clk->src_lcd0);
>>>> -	cfg &= ~(0xf);
>>>> -	cfg |= 0x6;
>>>> -	writel(cfg, &clk->src_lcd0);
>>>> +	clrsetbits_le32(&clk->src_lcd0, 0x9, 0x6);
>>>
>>> 0x9? It seems to be 0xf.
>>
>> I have set the only bit that must be cleared.
>>
>> In case, I want to set src_lcd0 register to 0x6(b0110).
>> Therefore, do not need to clear a bit of the second and third. (don't care bits)
>>
>> clrsetbits_le32(addr, 0x9, 0x6) == clrsetbits_le32(addr, 0xf, 0x6)
>> ( reg &= ~b1xx1, reg |= b0110 == reg &= ~b1111, reg |= b0110 )
>>
>> Do you think any way is better?
>>
> 
> No..
> 0xF is mask of FIMD0_SEL that is 4 bits.
> The mask value never be changed.
Right, It's not "don't care bit".
If we want to change the source clock, just change the last argument.
It's not fixed 0x6 as source clock.

Best Regards,
Jaehoon Chung

> 
> Thanks,
> Minkyu Kang.
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